package com.wzh.sending.utils;

import java.security.NoSuchAlgorithmException;

import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class JiaMi {
//	private static Logger log = Logger.getLogger(JiaMi.class);

    private String iv = "feie91o96t2q2p0p";
    private IvParameterSpec ivspec;
    private SecretKeySpec keyspec;
    private Cipher cipher;

    private String SecretKey = "8d0bfe2fb0311fd7";

    public JiaMi()
    {
        ivspec = new IvParameterSpec(iv.getBytes());

        keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");

        try {
            cipher = Cipher.getInstance("AES/CBC/NoPadding");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
//            Log.e(e.getMessage(),e);
        } catch (NoSuchPaddingException e) {
            // TODO Auto-generated catch block
//            log.error(e.getMessage(),e);
        }
    }

    public byte[] encrypt(String text) throws Exception
    {
        if(text == null || text.length() == 0)
            throw new Exception("Empty string");

        byte[] encrypted = null;

        try {
            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);

            encrypted = cipher.doFinal(padString(text).getBytes());
        } catch (Exception e)
        {           
            throw new Exception("[encrypt] " + e.getMessage());
        }

        return encrypted;
    }

    public byte[] decrypt(String code) throws Exception
    {
        if(code == null || code.length() == 0)
            throw new Exception("Empty string");

        byte[] decrypted = null;

        try {
            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

            decrypted = cipher.doFinal(hexToBytes(code));
        } catch (Exception e)
        {
            throw new Exception("[decrypt] " + e.getMessage());
        }
        return decrypted;
    }

    public static String bytesToHex(byte[] data)
    {
        if (data==null)
        {
            return null;
        }

        int len = data.length;
        String str = "";
        for (int i=0; i<len; i++) {
            if ((data[i]&0xFF)<16)
                str = str + "0" + Integer.toHexString(data[i]&0xFF);
            else
                str = str + Integer.toHexString(data[i]&0xFF);
        }
        return str;
    }

    public static byte[] hexToBytes(String str) {
        if (str==null) {
            return null;
        } else if (str.length() < 2) {
            return null;
        } else {
            int len = str.length() / 2;
            byte[] buffer = new byte[len];
            for (int i=0; i<len; i++) {
                buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
            }
            return buffer;
        }
    }

    private static String padString(String source)
    {
      char paddingChar = ' ';
      int size = 16;
      int x = source.length() % size;
      int padLength = size - x;

      for (int i = 0; i < padLength; i++)
      {
          source += paddingChar;
      }

      return source;
    }
    
    
    /**
     * 获取加密的字符串
     * @param telephone
     * @return
     * @throws Exception
     */
    public static String getScurity(String telephone) {
    	JiaMi jm=new JiaMi();
    	String encrypted="";
		try {
			if(!"".equals(telephone)){
				encrypted = JiaMi.bytesToHex(jm.encrypt(telephone));
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
//			log.error(e.getMessage(),e);
		}
    	return encrypted;
    }
    
    /**
     * 获取解密后的字符串
     * @param secuity
     * @throws Exception
     */
    public static String getJiemi(String secuity){
    	JiaMi jm=new JiaMi();
    	String decrypted="";
		try {
			if(!"".equals(secuity)){
				decrypted = new String(jm.decrypt(secuity));
			}
		} catch (Exception e) {
//			log.error(e.getMessage(),e);
		}
    	return decrypted.trim();
    }

}
